Immunogen sequence: MIRNGRGAAG GAEQPGPGGR RAVRVWCDGC YDMVHYGHSN QLRQARAMGD YLIVGVHTDE EIAKHKGPPV FTQEERYKMV QAIKWVDEVV PAAPYVTTLE TLDKYNCDFC VHGNDITLTV DGRDTYEEVK QAGRYRECKR TQGVSTTDLV GRMLLVTKAH HSSQEMSSEY REYADSFGKC PGGRNPWTGV SQFLQTSQKI IQFASGKEPQ PGE